How groups believed to be linked to Russia used Facebook for election meddling

September 13, 2017, 6:42 PM|We're learning more about how groups, believed to be linked to Russia, used Facebook to meddle in the 2016 election. "I think what we've seen so far from Facebook is only the tip of the iceberg," said Sen. Mark Warner, the ranking Democrat on the Senate Intelligence Committee. Jeff Pegues reports.